Tinning machine



Aug. 26 1924. 1,505,994

H. w. BUNDY TINNING MACHINE Filed Sept. 15 192B 2 Sheets-Sheet l GuanteAug. 26 1924. 1,505,994 H. 'W. BUNDY TINNING MACHINE Filed Sept. l5v19223 2 Sheets-Sheet 2 Patented Aug. 26, 1924.

PATENT OFFICE.

HARRY W. BUNDY, F DETROIT, MICHIGAN.

TINNING MACHINE.

Application led September 15, 1922.

To all lwhom t may concern Be it known that I, HARRY W. BUNDY, a citizenof the United States, residing at Detroit, in the county of' Wayne andState of Michigan, have invented certain new and useful Improvements inTinning Machines, of which the following is a specification.

This invention relates to machine for tinning strips of metal, that is,covering a ,strip of metal with a thin film of solder. The strip ofmetal is intended primarily to be used in the formation of a double plytube. The tinning is for the purpose of providing a film of solder forsweating the plies together when the tube has been formed into a pluralply cross section.

It is necessary in order to get high grade tubing that the film ofsolder be applied to the metal strip in such a way as to provide a.smooth lm'f-of uniform thickness and at the same time relativelyimperceptible thickness. The machine about to be described is adapted toaccomplish this purpose.

In the drawings Fig. 1 is a vertical longitudinal section of themachine.

Fig. 2 is -a detailed perspective of the transmission.

Fig. 3 is a detail of the sizing and pulling rolls.

Fig. 4 is a section taken on the line 4 4: of Fig. 3.

Fig. 5 is an enlarged view of the scraper.

The bed of the machine and the supports may be of any convenient form. At one end a bracket a supports a plurality of removable spools on whichare carried the coils of metal strips. It is preferable to have aplurality of spools so that the machine may go on uninterruptedly; bysimply fastening the end of the exhausted spool strip to one of theother strips on one of the other coils, the work can go on without 45'interruption. The ends of the strips of metal can be slotted and tonguedso that they can be easily fastened together by the operator while themachine is in motion.

The strip of metal c is drawn under the guide roll l and over the guideroll e thence Serial No. 588,338.

down into a bath of cleansing acid f, suc-h as muriatic acid. A roll gunder which the strip c runs, holds the strip in the acid bath. Thestrip then runs upwardly between the adjustable rubber rolls h whichpinches the strip and cleans off the acid. The strip then runs down andunder the roll z' in the solder bath j. The solder ba-th is keptconstantly molten by the heat from lthe flames of the burner le.

The strip then passes upwardly between the pullinoand sizing rolls fm.;these are detailed in Figs. 3 and 4. These sizing rolls are providedwith flanges n and o at opposite ends of the, two rolls, these flangesoverlapping the unlanged ends of the other roll. They consequently limitthe dimensions of the strip passing therebetweenand serve to size up thestrip to the proper shape at the edges.

. The strip then passes upwardly out of the solder bath between theedges of the heated scraping dies Q and 7". strip are kept hot at -thispoint by the burner 100. The driving and sizing rolls m serve, toavcertain extent, to make the film of solder on the strip more or lessuniform. Howeverj if the strip were taken out of the machine at thispoint, it would be found that there were a considerable number ofblotches of solder on the strip. The purpose of the scraping dies is tocompletely clean off this excess solder and make an even thin uniformiilm. The die fr is a movable one for two purposes. One is to permit theremoving of the die when the joint between two strips is passing betweenthe die and the other purpose is to have a gravity pressure of two diestoward each other. The handle s gives enough weight `and leverage tothis die to hold it against the strip with su'licient pressure toaccomplish the scraping action desired.

From the scraping dies the strip passes over the guide roll t and downunder the guide roll u in the water bath o. Above this ba'th the strippasses between the adjustable pressure rubber rolls w which serve toclean oftn the water and leave the strip bright and clean. The stripthen passes over the guide The dies and roll m on the spool y. There aretwo of these spools g/ so that when one spool lills up the strip may betransferred Ito the other spool.

The rolls m are the main driving rolls of the machine; these arepositively driven by the bolt z. The receiving -spool is also positivelydriven and serves to help pull the machine strip through the machine.The belt e is in turn driven by the belt 1. This belt 1 Ais connected upwith av suitable transmission such as detailed in Fig. 2 so that thespeed of the machine can be altered. The transmission shown in Fig. 2 isthe so-called Reeves transmission. It works o n the principle of havinga belt and two conical section pulleys. 2 designates the driving pulleywhich is connected up by a` power belt 3 with the source of power.4ldesignates the driven pulley which is connected up with the belt 1through a pulley 6 designates a screw shaft which maybe rotaited to rockthe walking beam-s. This rockrod 15 connects the two bent levers.

ing of walking beams causes one pulley to open Aup and the other pulleyto close up thereby lchanging the driving ratio. The screw shaft G canbe controlled from remote parts of the machine by chain 8 and the crank9.

y Of course the specific construction of the transmission is notmaterial. The point is that some suitable transmission should beprovided by which the machine may be 5 stripspools is nearly exhausted,the operator connects up the yend of the strip with the next `spool tobe fed into the machine. In doing this it is obviously necessary to slowup. the machine. Preferably tongues and slots `are provided at the ends.These can be interlocked and folded over so as to unite the two stripstogether. This permits one strip tok followthe other through themachine. `As the joint nears the scraping dies, the operator maytemporarily lift the movable scraping die r to permit it to pass. As thejoint `comes to the receiving spool, the operator shears the strip atthe joint and startsythe work on to the other spool.

` The solder bath roll z' and the acid bath roll-y' are. carried on thearms 10 and 1l: these arms are parts of bent levers pivoted at 12 and13. A hand lever 14 is connected up with one of these bent levers and adraft quently simply by shifting the hand lever 14 both rolls may besimultaneously lifted out of the two baths. The tin or solder bath ispreferably about parts of tin and 80 parts of lead.

y What I claim is:

Consef 1. In a machine for the purpose specified, the combination of asoldering bath, a pair of width sizing rolls located adjacent to thesoldering bath, and means for propelling a strip of metal through thesoldering bath and through the sizing rolls.

2. In a machine forthe purpose specified, thc combination of a solderingbath, a pair of flanged sizing and pulling rolls adjacent to thesoldering bath, and means for guiding a strip of metal through thesoldering bath and between the sizing and pulling rolls.

3. In a machine for the purpose specified,

of sizing rolls located adjacent to the soldering bath and comprisingrolls flanged only at one end, the flanges of the individual rolls beingon 4opposite ends and overlapping the unfianged ends, and means forpropelling and guiding the metal stripthrough the soldering bath andthrough such rolls.

4. In a machine for the purpose specified, vf

the combination of a soldering bath, a pair of sharp scraping `dies forscraping olf the excess metal located adjacent to the soldering bath,and means for propelling and guiding a strip of metal through thesoldering bath and through the scraping dies. i

In a machine for the purpose specified, the combination of a solderingbath, a pair of sharp scraping dies for scraping olf the l excess metal,one ofwvhich is stationary'and the other of 'which is` movable, thelatter being held in contact with the work by gravity, and means forpropelling and guiding a strip of metal through the soldering bath andbetween the scraping dies.

6. Ina machine for the purpose specified, the combination of a solderingbatln'a pair of sizing rolls, a pair of scraping dies, and means forsuccessively guiding and propelling a strip of metal through thesoldering bath, the sizing rolls and the scraping dies. i

7. In a machine for the purpose specified, the combination of asoldering bath, a water bath, means for propelling a strip of metalsuccessively through the soldering bath and the water bath, and meansfor scraping the excess metal olf the strip, said means located betweenthe sol'deringbath and water bath, and comprising a pair of diesarrangedto scrape oil the excess metal.

8. In a machine for the vpurpose speci-tied, the combination of asoldering bath, a water bath, means for propelling the strip of metaly.the combination of a soldering bath, a pair piece of metal successivelythrough the sollocated adjacent the soldering bath, inde- 10 dering bathand the Water bath, means for pendent means for heating said scrapingdies sizing the strip, and means for scraping the and the strip at thispoint, and means for excess solder from the strip, said two lastpropelling and guiding the strip of metal 5 mentioned means beinglocated between the through the soldering bath and through the solderingbath and water bath. scraping dies. 15

l0. In a machine for the purpose specified, In testimony whereof I aHiXmy signature.

the combination of a soldering bath, a pair of scraping dies for takingoff excess metal HARRY W. BUNDY.

